US Patent 7401005 Averaging trace function with indexing by a process signal

A recording of a first selectable process signal of a system is indexed by a second process signal that is different from the timing signal of the system. First process signals acquired in this way are stored in a memory as a function of the index-forming second process signal, wherein a measurement value represented by a first process signal is distributed over adjacent memory locations of the memory if the first acquired process signal has a non-integer index.